Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f69d860130519…

MALICIOUS

PDF

44.3 KB Created: 2020-08-17 01:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91e460ca67ea23fbc4663c679bdbafc1 SHA-1: 98d0c513bd1c8aa2f328003d1ae9ba4362e16c7e SHA-256: 770f69d8601305191bcc424ff0012c0423c8c61632d15a36a598b378fb26bb34
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'letters from santa template uk' and a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirection to a potentially malicious site suggest an attempt to lead the user to a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=letters+from+santa+template+uk
    • http://files.keystonecrossingassociation.com/uploads/1/3/1/3/131398091/remibo-depagu-todinudof.pdf
    • http://xijeso.meriadocbeagles.com/uploads/1/3/2/6/132683169/2a33457d8692.pdf
    • http://files.marissapriestley.com/uploads/1/3/1/4/131483400/31a9fa62a0f3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/vagopokomutiwologovek.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/loli_hentai_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/pure_edge_view.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/buloxoraludexezuxarovekix.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/3465423785.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/69836932100.pdf
    • https://cdn.shopify.com/s/files/1/0434/2765/9932/files/39389475669.pdf
    • https://cdn.shopify.com/s/files/1/0434/1904/1954/files/achilles_tendonitis_rehab_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/canvas_the_castle_oblivion.pdf
    • https://cdn.shopify.com/s/files/1/0437/3993/8970/files/zuzizajukigilesawakofow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/numotufonuperixatito.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f58.bin
6beda03ddb0d5ad63a51cb064bd91c8fc3430d4fa10be98d457432851178950c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F58 5052 bytes
font_01_sfnt_off00008074.bin
b1cae412434c09cc13413165d6fe302cab82bee24f77f57956869b1b97ce22d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8074 10596 bytes

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